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>Appendix F. Additional Supplied Modules</TD
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><H1
CLASS="SECT1"
><A
NAME="VACUUMLO"
>F.46. vacuumlo</A
></H1
><P
>  <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> is a simple utility program that will remove any
  <SPAN
CLASS="QUOTE"
>"orphaned"</SPAN
> large objects from a
  <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> database.  An orphaned large object (LO) is
  considered to be any LO whose OID does not appear in any <TT
CLASS="TYPE"
>oid</TT
> or
  <TT
CLASS="TYPE"
>lo</TT
> data column of the database.
 </P
><P
>  If you use this, you may also be interested in the <CODE
CLASS="FUNCTION"
>lo_manage</CODE
>
  trigger in the <A
HREF="lo.html"
>lo</A
> module.
  <CODE
CLASS="FUNCTION"
>lo_manage</CODE
> is useful to try
  to avoid creating orphaned LOs in the first place.
 </P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN137540"
>F.46.1. Usage</A
></H2
><PRE
CLASS="SYNOPSIS"
>vacuumlo [options] database [database2 ... databaseN]</PRE
><P
>   All databases named on the command line are processed.  Available options
   include:
  </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="OPTION"
>-v</TT
></DT
><DD
><P
>Write a lot of progress messages.</P
></DD
><DT
><TT
CLASS="OPTION"
>-n</TT
></DT
><DD
><P
>Don't remove anything, just show what would be done.</P
></DD
><DT
><TT
CLASS="OPTION"
>-U</TT
> <TT
CLASS="REPLACEABLE"
><I
>username</I
></TT
></DT
><DD
><P
>User name to connect as.</P
></DD
><DT
><TT
CLASS="OPTION"
>-w</TT
><BR><TT
CLASS="OPTION"
>--no-password</TT
></DT
><DD
><P
>      Never issue a password prompt.  If the server requires password
      authentication and a password is not available by other means
      such as a <TT
CLASS="FILENAME"
>.pgpass</TT
> file, the connection
      attempt will fail.  This option can be useful in batch jobs and
      scripts where no user is present to enter a password.
     </P
></DD
><DT
><TT
CLASS="OPTION"
>-W</TT
></DT
><DD
><P
>      Force <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> to prompt for a
      password before connecting to a database.
     </P
><P
>      This option is never essential, since
      <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> will automatically prompt
      for a password if the server demands password authentication.
      However, <SPAN
CLASS="APPLICATION"
>vacuumlo</SPAN
> will waste a
      connection attempt finding out that the server wants a password.
      In some cases it is worth typing <TT
CLASS="OPTION"
>-W</TT
> to avoid the extra
      connection attempt.
     </P
></DD
><DT
><TT
CLASS="OPTION"
>-h</TT
> <TT
CLASS="REPLACEABLE"
><I
>hostname</I
></TT
></DT
><DD
><P
>Database server's host.</P
></DD
><DT
><TT
CLASS="OPTION"
>-p</TT
> <TT
CLASS="REPLACEABLE"
><I
>port</I
></TT
></DT
><DD
><P
>Database server's port.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN137591"
>F.46.2. Method</A
></H2
><P
>   First, it builds a temporary table which contains all of the OIDs of the
   large objects in that database.
  </P
><P
>   It then scans through all columns in the database that are of type
   <TT
CLASS="TYPE"
>oid</TT
> or <TT
CLASS="TYPE"
>lo</TT
>, and removes matching entries from the
  temporary table.
  </P
><P
>   The remaining entries in the temp table identify orphaned LOs.
   These are removed.
  </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN137598"
>F.46.3. Author</A
></H2
><P
>   Peter Mount <CODE
CLASS="EMAIL"
>&#60;<A
HREF="mailto:peter@retep.org.uk"
>peter@retep.org.uk</A
>&#62;</CODE
>
  </P
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